Policy routing work in 2.2 but not in 2.4

From: Theodor Milkov (zimage@delbg.com)
Date: Fri Jan 18 2002 - 18:35:02 EST


Hello,

I recently upgraded one of our routers with 2.4.17 Linux kernel and
unfortunately my policy routing that used to work with 2.2.20 kernel
failed. Quick test:

# uname -r
2.2.20

# ip rule ls
0: from all lookup local
32765: from all to 1.1.1.1 tos 0x02 lookup 199
32766: from all lookup main
32767: from all lookup 253

# ip route ls table 199
1.1.1.1 via 10.0.0.2 dev eth1

# ip route get to 1.1.1.1 tos 0x02
1.1.1.1 tos 0x02 via 10.0.0.2 dev eth1 src 10.0.0.1
      cache mtu 1500 rtt 375ms

# ip route get to 1.1.1.1 tos 0x08
1.1.1.1 tos 0x08 via 192.168.0.1 dev eth0 src 192.168.0.2
      cache mtu 1500 rtt 375ms

In this example everything seems ok - 192.168.0.1 is default gw. Lets
see the next example:

# uname -r
2.4.17

# ip ru ls
0: from all lookup local
32765: from all to 1.1.1.1 tos 0x02 lookup 199
32766: from all lookup main
32767: from all lookup 253

# ip route ls table 199
1.1.1.1 via 10.0.0.2 dev eth2

# ip route get to 1.1.1.1 tos 0x02
RTNETLINK answers: Network is unreachable
# ip route get to 1.1.1.1 tos 0x08
RTNETLINK answers: Network is unreachable

So, in this example the 'ip rule' is ignored and thus lookup to table
199 never happens. Both kernels where compiled with
'CONFIG_IP_ROUTE_TOS=y'. iproute packages are iproute2-ss001007 for
linux-2.2 kernel and iproute2-ss010824 for linux-2.4. What could be wrong?

Best regards,

-- 
      Theodor Milkov           Administrator IP Networks
      Davidov Net              Phone: +359 (2) 730158
      PGP: http://www.zimage.delbg.com/zimage.asc

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